Millxrd  ephraim stockwell



(No Model.)

M. E. STOCKWBLL. AUTOMATIC GAR BRAKE.

N9, 484,620A Patented Oct. 18,1892.

UNITED STATESv PATENT OFFICE.

MILLARD EPHRAIM STOCKWELL, 0F GRAND RAPIDS, MICHIGAN, ASSIGNOR 0FONE-HALF TO SEYMOUR W. PEREGRINE, OF SAME PLACE.

AUTOMATIC CAR-BRAKE.

SPECIFICATION forming part of Letters Patent No. 484,620, dated October18, 1892.

.To all whom it may concern:

Be it known that I, MILLARD EPHRAIM STooKWELL, a citizen of the UnitedStates of America, residing at Grand Rapids, in the county of Kent andState of Michigan, have invented certain new and useful Improvements inAutomatic Car-Brakes, of which the following is a specification.

My invention is an improvement in automatic brakes for street andrailway cars; and its object is to provide a brake which shall be heldout of contact with the wheels while there is any pull upon thedraw-bar, but which will be applied to stop the car when this strain isremoved.

The invention is illustrated in the accompanying drawings, in which- 4Figure 1 is a side elevation of a truck and a section of a portion of acar embodying my invention.

In the drawings, 1 1 are the Wheels of the car, and 2 is a portion ofthe body thereof.

Secured to the bottom of the car and between the two adjacent wheels ofthe truck, upon each side, are the brackets 3, in which is journaled theshaft 4. This shaft is connected with the draw-bar 5, running the entirelength beneath the car, by the short lever or extension 6. Thebrake-blocks 7 are suspended from the bottom of the car by chains orlinks 8, and are provided with the togglelevers 9, which are adjustablelongitudinally The inner ends of these toggle-levers are pivotallysecured to an extension 10, formed upon the lower end of the link 11,which is carried upon the shaft 4, and the upper end of this link issecured to the pressure-cap 12, formed with a flat under surface. Thepressure-cap has a vertical sliding movement by a short rod 13,extending down from the under side of the car. A'coiled spring 14surrounds this rod between the cap and the bottom of the car and tendsto keep the cap and link forced downward and through the toggle-leversto keep the brake-blocks applied firmly to the wheels. A block l5 isrigidly secured to the shaft 4 beneath the dat under surface of thepressure-cap, and this block is formed with a fiat upper surface androunded edges. When there is no pull upon the draw-bar in eitherdirection, the pressure of the spring 14 upon the pressure-cap forcesthe link downward, and the brake is thus applied. When,

Figs.A 2, 3, and 4 are detail views.v

Application iiled'ebruary 4, 1892. SerialNo. 420,277. (No model.)

however, there is any draft upon the drawbar in pulling the carin eitherdirection, the pull is imparted to the lever 6 to turn the shaft andwith it the block 15, the rounded corners of which bear against theunder face of the cap 12 and raise the saine against the pressure of thespring, thus drawing up the 6o link with the inner ends of thetoggle-levers and releasing the blocks from contact with the wheels.Springs may be provided to keep the draw-bar in its normal position whenthere is no draft upon it. A stop o is provided on the draw-bar 5, whichcomes against the bar P'when the draw-bar is pulled out. This stopprevents the draw-bar from being pulled too far out.

A hand operating-lever may be used for 7o operating the brakesindependent of the draft of the car.

I claim as my invention- 1. An automatic car-brake consisting of theblocks suspended from the car, toggle-levers connected with the blocks,a cap under springpressure connected with the toggle-levers, a shaftjournaled beneath the car, a pressureblock rigidly mounted thereonbeneath the pressure-cap, and a connection between the 8o shaft anddraw-bar, whereby the pull upon the draw-bar operates to rotate theshaft and pressure-block to raise the cap andjrelease the brake.

2. In combination, the brake-blocks, the toggle-levers, a press`urecapon a rod carried by the car-body, a spring for forcing the cap downward,a link connection between the cap andlevers, a shaft journaled beneaththe car, having a block rigidly secured thereto be- 9o neath the cap,and a lever connection between the shaft and draw-bar.

3. In combination, the brake-blocks, the transverse shaft 4, theverticallymovable blocks 12, operated by said shaft and connected to thebrake-blocks, the draw-bar connected to the shaft 4, and the hand-leverfor operating the brakes independently of the draft of the car.

In testimony whereof I affix my signature in loo presence of twowitnesses.

MILLARD EPHRAIM STOCKWELL.

Witnesses:

JOHN L. BUCHANAN, E. J. REUKER.

